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What is the probability that a PIN assigned at random has at least one 0?
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The personal identification numbers (PINs) for automatic teller machines usually consist of four digits. You notice that most of your PINs have at least one 0, and you wonder if the issuers use lots of 0s to make the numbers easy to remember. Suppose that PINs are assigned at random, so that all four-digit numbers are equally likely.
(a) How many possible PINs are there?
(b) What is the probability that a PIN assigned at random has at least one 0?
asked
8 years
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Probability
by
anonymous
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Flat feet is a recessive trait. Butch and Blanche are about to have their first child. They both have "normal" feet but Blanche's father has flat feet and Butch has a child from a previous marriage who has flat feet. What is the probability that they will have a girl with normal feet?
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